/**
* @brief Test if point is "visible" from team.
* @param[in] team A team to test.
* @param[in] point A point to check.
* @return true if point is "visible"
*/
static bool G_TeamPointVis (int team, const vec3_t point)
{
Edict *from = nullptr;
vec3_t eye;
/* test if point is visible from team */
while ((from = G_EdictsGetNextLivingActorOfTeam(from, team))) {
if (G_FrustumVis(from, point)) {
/* get viewers eye height */
G_ActorGetEyeVector(from, eye);
/* line of sight */
if (!G_TestLine(eye, point)) {
const float distance = VectorDist(from->origin, point);
bool blocked = false;
/* check visibility in the smoke */
if (distance >= UNIT_SIZE) {
Edict *e = nullptr;
while ((e = G_EdictsGetNextInUse(e))) {
if (G_IsSmoke(e) && RayIntersectAABB(eye, point, e->absmin, e->absmax)) {
blocked = true;
break;
}
}
}
if (!blocked)
return true;
}
}
}
/* not visible */
return false;
}
/**
* @brief tests for smoke interference
* @param[in] from The point to check visibility from
* @param[in] check The edict to check visibility to
* @return true if @c check is invisible from @c from (smoke is in the way), false otherwise.
*/
bool G_SmokeVis (const vec3_t from, const Edict* check)
{
const float distance = VectorDist(check->origin, from);
/* units that are very close are visible in the smoke */
if (distance > UNIT_SIZE * 1.5f) {
Edict* e = nullptr;
while ((e = G_EdictsGetNextInUse(e))) {
if (G_IsSmoke(e)) {
if (RayIntersectAABB(from, check->absBox.mins, e->absBox)
|| RayIntersectAABB(from, check->absBox.maxs, e->absBox)) {
return true;
}
}
}
}
return false;
}
/**
* @brief calculate how much check is "visible" from @c from
* @param[in] from The world coordinate to check from
* @param[in] ent The source edict of the check
* @param[in] check The edict to check how good (or if at all) it is visible
* @param[in] full Perform a full check in different directions. If this is
* @c false the actor is fully visible if one vis check returned @c true. With
* @c true this function can also return a value != 0.0 and != 1.0. Try to only
* use @c true if you really need the full check. Full checks are of course
* more expensive.
* @return a value between 0.0 and 1.0 which reflects the visibility from 0
* to 100 percent
* @note This call isn't cheap - try to do this only if you really need the
* visibility check or the statement whether one particular actor see another
* particular actor.
* @sa CL_ActorVis
*/
float G_ActorVis (const vec3_t from, const edict_t *ent, const edict_t *check, bool full)
{
vec3_t test, dir;
float delta;
int i, n;
const float distance = VectorDist(check->origin, ent->origin);
/* units that are very close are visible in the smoke */
if (distance > UNIT_SIZE * 1.5f) {
vec3_t eyeEnt;
edict_t *e = NULL;
G_ActorGetEyeVector(ent, eyeEnt);
while ((e = G_EdictsGetNext(e))) {
if (G_IsSmoke(e)) {
if (RayIntersectAABB(eyeEnt, check->absmin, e->absmin, e->absmax)
|| RayIntersectAABB(eyeEnt, check->absmax, e->absmin, e->absmax)) {
return ACTOR_VIS_0;
}
}
}
}
/* start on eye height */
VectorCopy(check->origin, test);
if (G_IsDead(check)) {
test[2] += PLAYER_DEAD;
delta = 0;
} else if (G_IsCrouched(check)) {
test[2] += PLAYER_CROUCH - 2;
delta = (PLAYER_CROUCH - PLAYER_MIN) / 2 - 2;
} else {
test[2] += PLAYER_STAND;
delta = (PLAYER_STAND - PLAYER_MIN) / 2 - 2;
}
/* side shifting -> better checks */
dir[0] = from[1] - check->origin[1];
dir[1] = check->origin[0] - from[0];
dir[2] = 0;
VectorNormalizeFast(dir);
VectorMA(test, -7, dir, test);
/* do 3 tests */
n = 0;
for (i = 0; i < 3; i++) {
if (!G_LineVis(from, test)) {
if (full)
n++;
else
return ACTOR_VIS_100;
}
/* look further down or stop */
if (!delta) {
if (n > 0)
return ACTOR_VIS_100;
else
return ACTOR_VIS_0;
}
VectorMA(test, 7, dir, test);
test[2] -= delta;
}
/* return factor */
switch (n) {
case 0:
return ACTOR_VIS_0;
case 1:
return ACTOR_VIS_10;
case 2:
return ACTOR_VIS_50;
default:
return ACTOR_VIS_100;
}
}